I thought it had been bandied about that Deepseek had exfiltrated a bunch of data from OpenAI's models, which was then used to train theirs? Did this ultimately prove untrue? My apologies, I don't always keep up on the latest drama in the AI circles - so maybe that has been well proven wrong.
Sam Altman threw a fit and claimed this, without providing evidence. He's... not exactly a person to trust blindly. Training on other model outputs (or at least doing sanity checks against them) is pretty common, but these models seem very different, DS has prior art, and by all signs this claim makes little sense and is hard to believe.
one man's exfiltration is another man's distillation `¯\_(ツ)_/¯`
you could say they're playing by a different set of rules, but distilling from the best available model is the current meta across the industry. only they know what fraction of their post-training data is generated from openai models, but personally i'd bet my ass it's greater than zero because they are clearly competent and in their position it would have been dumb to not do this.
however you want to frame it, they have pushed the field forward -- especially in the realm of open-weight models.